Compton desintegration of positronium

We study the Compton disintegration of positronium in comparison with the same of hydrogen. The initial photon energy of a few keV allows one to apply the non-relativistic approach and use A2 approximation. Interesting features in the behavior of various differential cross sections are observed. In particular, the conditions were found, under which the electron and positron move parallel to each other with equal velocities. This leads to a number of specific Coulomb resonances